/*
 * Copyright 2024 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package androidx.pdf.viewer.coroutines

import kotlinx.coroutines.CancellationException
import kotlinx.coroutines.coroutineScope
import kotlinx.coroutines.delay
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.launch

internal suspend fun <T> Flow<T>.toListDuring(durationInMillis: Long): List<T> = coroutineScope {
    val result = mutableListOf<T>()
    val job = launch { this@toListDuring.collect(result::add) }
    delay(durationInMillis)
    job.cancel()
    return@coroutineScope result
}

internal suspend fun <T> Flow<T>.collectTill(
    result: MutableList<T>,
    predicate: suspend (value: T) -> Boolean,
) {
    collect { value ->
        result.add(value)
        if (predicate(value)) throw CancellationException()
    }
}
